Typewriting machine



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J. A. B. SMITH TYPEWRITING MACHINE OriBZ I a Filed Nov. 16 1921 Dec. 6, 1927.

In ven'for': MM/W'z ATIOFHZ I w s Dec. 6,192 7. UNITED STATES.

PATENT OFFICE.

p JESSE A. B. m, OF STAMFORD, CONNiCTICUT, 'ASSIGNOB To UNDIBWOOD TYPE- "WBITEB COMPANY, OI mzw YORK, N. Y., A COBPOBA'IIOK OI DELAWARE.

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- Original application filed Iovember 18 1921, Serial No. 515,487. Divided and June 84, 1924. Serial Io. 781,887.

vember 16, 1921 (-now Patent No. 1,521,336,"

dated December 30,1924).

ing the cover of the casing when access to the interior thereof, for erasures or other urposes, is desired. Heretofore, the cover has been opened by means of a fingeriece rigidly secured to the front-thereof. uch opening means, however, requires movement of the operators handa considerable distance from the keyboard. 3

Another object of the invention is the m nvision of means whereby the casing-cover maybe opened from the immediate vicinitv oft-he keyboardiso thatthe efiort and time involved 1n the cover-opening operation may be lessened. Y i a A feature of the invention is the employ ment of alever connected to the cover and hinged to the body-portion of the casing 26 for opening or initlatmg the opening movement of the cover from the v1cinity of thekeyboard, and of aspringdevice normally ineffective to openthe cover against the 'weight thereof, but which, when the openiriifg movement has been initiated, becomes e (active to urge the cover toward open position.

Other features of the invention relate to connections betweenthe hand-lever, re'-.

keyboard-j and to. means for renderingsoundroof the openings in the casing-wall which the lever and its connections throng "Other features and advantages will hereinafter appear. In the accompanyingdrawings, v

' Figure -.1 is a view inside elevatlomapartin cross-section, of a casing. embo ying t e, attachmentsof the present invention; the casing being partly broken away to indicate the typewntin ma chine, andto show certain connections eteln.

said, in'

this application filed Figure 2 is a to plan view, in cross-sect1on, of the rightand side of the casing; the cover-actuating lever being shown therein in its relation to the casing body and to the end of the\ typewriting machine frame. The invention relates to means for open-1 Referring to the drawings, the casing is shownas comprisin a body-portion 1, and a cover-portion 2 hmged to the bod -portion at 3. The body-portion is rovide with a lining indicated at 4, and t e cover with a similar lining as indicated at 5. The cover is also shown as having a strip 6 of celluloid or other smooth material, to prevent the work-sheet 7 from catching on the lining. The position of the laten is indicated in dotted lines at 8 (Figure 1), on the carriage of the tygewriting machine, part of the typewriter ame bein shown at 95 the keyboard extension 10. o? the typewriting machine protruding through a suitable opening in the front wall 11 of the body'- portion of the casing. A slot 12, which extends horizontally lengthwise of the front wall of the casing-cover, isnormally closed by ieldable cushions (not shown). Through th lever 13, carriage-release lever 14, and carriage-return arm 15, which are all'mounted upon the typewriter carriage and which move along the slot 12 between the yieldable body-cushions which' form the same, asthe carria of-the typewriting machine has its lettereedand return movements.

Gravity normally holds the cover in the closed position upon the body-portion 1 of the casin Spring-devices are rovided, one at eit er side of the casing within the same, to assist the opening movement of the ,co'ver after the operation of opening the cover has been initiated, as hereinafter described. Each of these sprin -devices comprises a cylinder 16, ivote at 17 to a racket 18 on the insi e of the body-portion of the casing; and also consists of a rodor plunger 19, ivoted at 20 to a bracket 21 out e inside 0 the cover-portion of the casing. The rod or plunger .19 of each of the spring-devices carries a piston 2 between which piston and the end wall 3 of the cylinder'16, in which the piston operates, is a slpring 26 which assists, as aforet e cover-opening operation. A b f -sp n em r c s h P s-r24 is slot protrude the line-space 19 and seated between the piston 22 and a cap 28 closing the cylinder, serves to prevent shoeks' to the casing when the cover arrives at open position, and to prevent noises caused b said shocks. It will be understood that tie positions of the pivots of the spring cover-opening devices, and the tension of the springs therein, and the proportions of the parts, are all designed so that accidental opening of the cover, under the action of the springs, will not occur, and so that the s rings will not offer undue resistance to tie closing of the cover. For example, when the cover is closed, as shown in Figure 1, the piston 22 is in such position that the spring 26 is at its greatest compression, ready to act with effectiveness as soon as the cover is partly lifted. On the contrary, when the cover is fully open, the s ring 26 is relaxed and therefore offers litt e resistance to the closing of the cover until the cover has reached such position that the weight thereof will effectively assist in the closing operation in compensation for the increasing resistance offered by the spring.

The opening of the cover is initiated, and

may be carried through, by means of connections as follows.

initiated by the palm-piece 34, the pivots Pivoted at- 30 on a bracket 31, secured by screws 32 to the inside wall of the casing-body, in such manner as to have vertical movement between the full and dotted line'positions shown in Figure 1, is a lever 33, carrying a palm-piece 34. The rear end of the lever 33 has a pin-and-slot pivotal connection at 34, to one arm 35 of a bell-crank lever, pivoted at 36 to a bracket 37 on the rear outside wall of the bodyportion ofthe casing. The other arm 38 of this bell-crank lever is pivoted at 39 to an arm 40, the other end of which arm. 40 is pivoted at 4:1 to a bracket 42 on the rear of the cover-portion of the casing. Depression of the palm-piece34, from full to dotted line, Figure 1, position, causes the bellcrank lever 3538 to be rocked back, drawing down the arm 40 and initiating or carrying through the movement of the cover from the full to the dotted line position thereof shown in Figure 1.

Once the opening of the cover has been of the plungers 19 are lifted to such position that a leverage is obtained whereby the springs 26 may be effective in the coveropening operation. When it is desired to close the cover, the alm-piece 34 may be lifted, thus causing t e arms 38 and 40 to act, in effect, as atoggle, in creating an upward pressure to lift the cover, and as a linkage to swing the cover forward against the resistance of the springs 26.

passes through, and operates in, a suitable slot in the front wall of the casing-body; and a suitable stop 61, in the form of a bent finger at the bottom of the keyboard extension of the typewriter, serves to limit the downward throw of the palm-piece 34. Two strips 62 and 63, of yieldable, resilient, sound-deadening material, such as felt, are secured to the inner, front wall of the casingbody, adjacent the slot 60, and have their free edges normally abutting one another along the central line of the slot; thus closing the slot except where the opposing lips of the lining-strips are held apart by the arm of the lever. Similarly secured to the rear wall of the casing-body, adjacent the slot 65, in which the arm 35 of the bell-crank lever protrudes, are two abutting strips 66 and 67, of yieldable, resilient, sound-deadening material, such as felt, for closing the slot against the emission of sounds generating within the casing.

Variations may be resorted to within the scope of the invention, and ortionsof the improvements ma be used without others.

Having thus escribed my invention, I claim:

1. A sound-deadening casing for a typewriting machine, having i1 body-portion including front and rear walls, a cover hinged to the rear wall to swing vertically and normally maintained by gravity in =closed position, the front wall of said body-portion having an opening through which the keyboard of the machine projects and also a vertical slot adjacent the side of said keyboard, a lever pivoted within said bodyortion, one of the arms of the lever exten ing through-said slotto an operative position beside the keyboard, the opposite arm of the lever extending toward the rear wall, a bellcrank mounted on said rear wall, the latter having a vertical slot through which the forward arm of the bell-crankprojects, a'pivotal connection between said bell-crank-arm and said opposite arm of the lever, a link connecting the other arm of the bell-crank to the cover, a cylinder ivoted to the body-portion, a normally inc ective spring and piston within the cylinder associated with said body-portion, and a piston-carrying rod pivoted to the cover, the spring being arranged to expand against the piston, the cylinder, spring and pivots for the cylinder and rod being on a dead center when the cover is in its closed position, said lever effecting an initial raising of the cover and breaking said dead center, the spring becoming effective after the breaking of said dead center to swing the "cover upwardly to fully open position.

2. A sound-deadening casing for a typewriting machine, having a body-portion ineluding front and rear wal1s,a cover hinged As shown in Figure 2, the lever-arm 33' to the rear wall to swing vertically and normally maintained by gravity in closed posit'ion, the front' wall of said body-portion having an opening through which the keyboard of the'machine projects and also a slot adjacent the side of said keyboard, a

lever pivoted within said body-portion, one

of the arms of the lever extending through crank projects, a connection between said bell-crank-arm and said opposite arm of the lever, a link connectingthe other arm of the bell-crank to'the cover, a spring-device including a cylindrical casing pivotally secured to the body-portion, a piston-carrying rod slidable within said casing and pivotally secured to the cover, a spring within said cylinder and arranged to expand against the piston, to fully open the cover, afterv said lever has caused a partial raising thereof, and a second spring on the opposite side of the piston effective to cushion the cover-ppening operation.

JESSE A. B. SMITH. 

